From: Steven Rostedt With the addition of commit: c7b0930857e2278f2e7714db6294e94c57f623b0 ring-buffer: prevent adding write in discarded area The ring buffer may now add discarded events when a write passes the end of a buffer page. Before, a discarded event was only added when the tracer deliberately created one. The ring buffer benchmark test does not handle discarded events when it reads the buffer and fails when it encounters one. Also fix the increment for large data entries (luckily, the test did not add any yet). [ Impact: fix false failure of ring buffer self test ] Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer_benchmark.c | 8 +++++--- 1 files changed, 5 insertions(+), 3 deletions(-) diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index 8d68e14..cf6b0f5 100644 --- a/kernel/trace/ring_buffer_benchmark.c +++ b/kernel/trace/ring_buffer_benchmark.c @@ -102,8 +102,10 @@ static enum event_status read_page(int cpu) event = (void *)&rpage->data[i]; switch (event->type_len) { case RINGBUF_TYPE_PADDING: - /* We don't expect any padding */ - KILL_TEST(); + /* failed writes may be discarded events */ + if (!event->time_delta) + KILL_TEST(); + inc = event->array[0] + 4; break; case RINGBUF_TYPE_TIME_EXTEND: inc = 8; @@ -119,7 +121,7 @@ static enum event_status read_page(int cpu) KILL_TEST(); break; } - inc = event->array[0]; + inc = event->array[0] + 4; break; default: entry = ring_buffer_event_data(event); -- 1.6.3.1 -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/